Four rolls work like this: the plate is clamped between the upper and lower central rolls, while two side rolls set the radius. The blank does not move in the clamp, so it does not have to be aligned before every pass, and the edge is pre-bent at the start and at the end without removing the plate. The result is less handling and identical shells across a batch.

LUNA offers three ranges. The LUNA Nebula 4R-S 1250/1.2 and the rest of the 4R-S series are compact machines with servo drives and a Siemens PLC for 1.2–4.5 mm plate at widths of 1050–1550 mm. The 4R series, such as the LUNA Nebula 4R 2550/4, is hydraulic with a digital readout: 1050–4050 mm and plate of 2.5–10 mm. The 4R-H series is the heavy class: widths of 2050–6100 mm, plate of 8–40 mm and a top roll of 280–620 mm.

The Italian MG M-ME-ML series covers the whole range: from the MG M-ME-ML 0501 L — 550 mm and 1.5 mm plate — up to heavy models 3100 mm wide for plate up to 160 mm, with a top roll up to 940 mm.

If the parts are different every time, three-roll machines are simpler and cheaper, and for batches of thin-walled cylinders there are two-roll benders. How to compare plate rolls is covered on the plate rolls.

Four-roll plate rolls in the catalog

Model	Working width	Plate thickness	Pre-bending	Top roll	Power
LUNA Nebula 4R-S 1050/1.2	1050 mm	1.2 mm	—	52 mm	3 kW
LUNA Nebula 4R-S 1050/1.5	1050 mm	1.5 mm	—	60 mm	3 kW
LUNA Nebula 4R-S 1050/1.8	1050 mm	1.8 mm	—	70 mm	3 kW
LUNA Nebula 4R-S 1050/2.5	1050 mm	2.5 mm	—	85 mm	3 kW
LUNA Nebula 4R-S 1050/3.2	1050 mm	3.2 mm	—	100 mm	3 kW
LUNA Nebula 4R-S 1050/4.5	1050 mm	4.5 mm	—	120 mm	3 kW
LUNA Nebula 4R-S 1250/1.2	1250 mm	1.2 mm	—	60 mm	3 kW
LUNA Nebula 4R-S 1250/3	1250 mm	3 mm	—	100 mm	3 kW
LUNA Nebula 4R-S 1550/1.8	1550 mm	1.8 mm	—	85 mm	3 kW
LUNA Nebula 4R-S 1550/2.4	1550 mm	2.4 mm	—	100 mm	3 kW
LUNA Nebula 4R 1050/2.5	1050 mm	2.5 / 3.5 mm	2 / 2.5 mm	100 mm	1.1 / 0.75 kW
LUNA Nebula 4R 1050/3	1050 mm	3 / 5 mm	2.5 / 3 mm	130 mm	2.2 / 1.1 kW
LUNA Nebula 4R 1270/5	1270 mm	5 / 7 mm	4 / 5 mm	150 mm	2.2 / 1.1 kW
LUNA Nebula 4R 1270/7.5	1270 mm	7.5 / 10 mm	5.5 / 7.5 mm	180 mm	4 / 1.5 kW
LUNA Nebula 4R 1270/10	1270 mm	10 / 12 mm	8 / 10 mm	200 mm	4 / 1.5 kW
LUNA Nebula 4R 1550/4.5	1550 mm	4.5 / 6.5 mm	3.5 / 4.5 mm	150 mm	2.2 / 1.1 kW
LUNA Nebula 4R 1550/7	1550 mm	7 / 9 mm	5 / 7 mm	180 mm	4 / 1.5 kW
LUNA Nebula 4R 1550/10	1550 mm	10 / 12 mm	8 / 10 mm	220 mm	5.5 / 1.5 kW
LUNA Nebula 4R 2050/4	2050 mm	4 / 6 mm	3 / 4 mm	150 mm	2.2 / 1.1 kW
LUNA Nebula 4R 2050/6	2050 mm	6 / 8 mm	4 / 6 mm	180 mm	4 / 1.5 kW
LUNA Nebula 4R 2050/8	2050 mm	8 / 10 mm	6 / 8 mm	200 mm	4 / 1.5 kW
LUNA Nebula 4R 2050/9	2050 mm	9 / 11 mm	7 / 9 mm	220 mm	5.5 / 1.5 kW
LUNA Nebula 4R 2050/10	2050 mm	10 / 12 mm	8 / 10 mm	250 mm	7.5 / 1.5 kW
LUNA Nebula 4R 2550/4	2550 mm	4 / 6 mm	3 / 4 mm	180 mm	4 / 1.5 kW
LUNA Nebula 4R 2550/6	2550 mm	6 / 8 mm	4 / 6 mm	200 mm	4 / 1.5 kW
LUNA Nebula 4R 2550/7	2550 mm	7 / 9 mm	5 / 7 mm	220 mm	5.5 / 1.5 kW
LUNA Nebula 4R 2550/8	2550 mm	8 / 10 mm	6 / 8 mm	250 mm	7.5 / 1.5 kW
LUNA Nebula 4R 3050/3	3050 mm	3 / 4 mm	2 / 3 mm	180 mm	4 / 1.5 kW
LUNA Nebula 4R 3050/4	3050 mm	4 / 6 mm	3 / 4 mm	200 mm	4 / 1.5 kW
LUNA Nebula 4R 3050/6	3050 mm	6 / 8 mm	4 / 6 mm	220 mm	5.5 / 1.5 kW
LUNA Nebula 4R 3050/7	3050 mm	7 / 9 mm	5 / 7 mm	250 mm	7.5 / 1.5 kW
LUNA Nebula 4R 4050/4	4050 mm	4 / 6 mm	3 / 4 mm	250 mm	7.5 / 1.5 kW
LUNA Nebula 4R-H 2050/20	2050 mm	20 / 16 mm	16 / 13 mm	280 mm	16.5 kW
LUNA Nebula 4R-H 2050/25	2050 mm	25 / 20 mm	20 / 16 mm	320 mm	20 kW
LUNA Nebula 4R-H 2050/30	2050 mm	30 / 25 mm	25 / 20 mm	350 mm	23 kW
LUNA Nebula 4R-H 2050/40	2050 mm	40 / 30 mm	30 / 25 mm	380 mm	30 kW
LUNA Nebula 4R-H 2550/16	2550 mm	16 / 13 mm	13 / 10 mm	280 mm	18 kW
LUNA Nebula 4R-H 2550/20	2550 mm	20 / 16 mm	16 / 13 mm	320 mm	20 kW
LUNA Nebula 4R-H 2550/25	2550 mm	25 / 20 mm	20 / 16 mm	350 mm	23 kW
LUNA Nebula 4R-H 2550/30	2550 mm	30 / 25 mm	25 / 20 mm	380 mm	32 kW
LUNA Nebula 4R-H 3100/13	3100 mm	13 / 10 mm	10 / 8 mm	280 mm	18 kW
LUNA Nebula 4R-H 3100/16	3100 mm	16 / 13 mm	13 / 10 mm	320 mm	20 kW
LUNA Nebula 4R-H 3100/20	3100 mm	20 / 16 mm	16 / 13 mm	350 mm	23 kW
LUNA Nebula 4R-H 3100/25	3100 mm	25 / 20 mm	20 / 16 mm	380 mm	32 kW
LUNA Nebula 4R-H 4100/8	4100 mm	8 / 6 mm	6 / 4 mm	280 mm	18 kW
LUNA Nebula 4R-H 4100/10	4100 mm	10 / 8 mm	8 / 6 mm	320 mm	20 kW
LUNA Nebula 4R-H 4100/13	4100 mm	13 / 10 mm	10 / 8 mm	350 mm	23 kW
LUNA Nebula 4R-H 4100/16	4100 mm	16 / 13 mm	13 / 10 mm	380 mm	32 kW
LUNA Nebula 4R-H 4100/20	4100 mm	20 / 16 mm	16 / 12 mm	400 mm	38.5 kW
LUNA Nebula 4R-H 4100/25	4100 mm	25 / 20 mm	20 / 16 mm	460 mm	38.5 kW
LUNA Nebula 4R-H 4100/35	4100 mm	35 / 25 mm	25 / 20 mm	500 mm	60 kW
LUNA Nebula 4R-H 4100/40	4100 mm	40 / 30 mm	30 / 25 mm	550 mm	66 kW
LUNA Nebula 4R-H 6100/8	6100 mm	8 / 6 mm	6 / 4 mm	350 mm	23.5 kW
LUNA Nebula 4R-H 6100/10	6100 mm	10 / 8 mm	8 / 6 mm	380 mm	31.5 kW
LUNA Nebula 4R-H 6100/13	6100 mm	13 / 10 mm	10 / 8 mm	400 mm	38.5 kW
LUNA Nebula 4R-H 6100/15	6100 mm	15 / 12 mm	12 / 10 mm	460 mm	38.5 kW
LUNA Nebula 4R-H 6100/20	6100 mm	20 / 16 mm	16 / 12 mm	500 mm	60 kW
LUNA Nebula 4R-H 6100/25	6100 mm	25 / 20 mm	20 / 16 mm	550 mm	66 kW
LUNA Nebula 4R-H 6100/30	6100 mm	30 / 25 mm	25 / 20 mm	620 mm	123 kW
MG M-ME-ML 0501 L	550 mm	1.5 mm	1 mm	70 mm	3 kW
MG M-ME-ML 1003 L	1050 mm	3 mm	2 mm	90 mm	3 kW
MG M-ME-ML 1206 P	1250 mm	6 mm	3 mm	115 mm	3 kW
MG M-ME-ML 1504 P	1500 mm	4 mm	3 mm	110 mm	3 kW
MG M-ME-ML 1706 P	1750 mm	6 mm	4 mm	130 mm	3 kW
MG M-ME-ML 2004 P	2050 mm	4 mm	2 mm	140 mm	4 kW
MG M-ME-ML 2006 P	2050 mm	6 mm	4 mm	160 mm	4 kW
MG M-ME-ML 2008 A	2050 mm	8 mm	6 mm	190 mm	4 kW
MG M-ME-ML 2010 B	2050 mm	10 mm	8 mm	210 mm	5.5 kW
MG M-ME-ML 2014 R	2050 mm	14 mm	10 mm	250 mm	7.5 kW
MG M-ME-ML 2020 C	2050 mm	20 mm	14 mm	280 mm	10 kW
MG M-ME-ML 2028 D	2050 mm	28 mm	20 mm	330 mm	15 kW
MG M-ME-ML 2038 E	2050 mm	38 mm	30 mm	370 mm	20 kW
MG M-ME-ML 2045 F	2050 mm	45 mm	35 mm	430 mm	30 kW
MG M-ME-ML 2060 H	2050 mm	60 mm	50 mm	510 mm	40 kW
MG M-ME-ML 2075 I	2050 mm	75 mm	60 mm	550 mm	50 kW
MG M-ME-ML 2100 Y	2050 mm	100 mm	75 mm	590 mm	75 kW
MG M-ME-ML 2506 P	2600 mm	6 mm	4 mm	180 mm	4 kW
MG M-ME-ML 2510 R	2600 mm	10 mm	8 mm	210 mm	5.5 kW
MG M-ME-ML 2514 B	2600 mm	14 mm	10 mm	240 mm	7.5 kW
MG M-ME-ML 2520 C	2600 mm	20 mm	15 mm	280 mm	10 kW
MG M-ME-ML 2538 E	2600 mm	38 mm	30 mm	390 mm	20 kW
MG M-ME-ML 2550 G	2600 mm	50 mm	40 mm	480 mm	30 kW
MG M-ME-ML 2565 H	2600 mm	65 mm	50 mm	520 mm	40 kW
MG M-ME-ML 2575 I	2600 mm	75 mm	60 mm	560 mm	50 kW
MG M-ME-ML 2590 Y	2600 mm	90 mm	70 mm	630 mm	75 kW
MG M-ME-ML 3006 A	3100 mm	6 mm	4 mm	200 mm	4 kW
MG M-ME-ML 3010 B	3100 mm	10 mm	8 mm	250 mm	7.5 kW
MG M-ME-ML 3015 C	3100 mm	15 mm	10 mm	290 mm	10 kW
MG M-ME-ML 3022 D	3100 mm	22 mm	17 mm	350 mm	15 kW
MG M-ME-ML 3035 E	3100 mm	35 mm	28 mm	440 mm	30 kW
MG M-ME-ML 3042 G	3100 mm	42 mm	33 mm	470 mm	40 kW
MG M-ME-ML 3055 H	3100 mm	55 mm	40 mm	530 mm	50 kW
MG M-ME-ML 3065 I	3100 mm	65 mm	50 mm	600 mm	60 kW
MG M-ME-ML 3120 T	3100 mm	120 mm	90 mm	760 mm	100 kW
MG M-ME-ML 3140 V	3100 mm	140 mm	110 mm	870 mm	130 kW
MG M-ME-ML 3160 Z	3100 mm	160 mm	120 mm	940 mm	180 kW

Questions and answers

4R-S, 4R or 4R-H?

4R-S are compact servo-driven machines with programmable control for thin plate of 1.2–4.5 mm, chosen for batches of identical parts. 4R are hydraulic with a digital readout for 2.5–10 mm plate and widths up to 4050 mm — the main working class. 4R-H are the heavy machines: up to 6100 mm wide and 40 mm thick.

Do four rolls pay off against three?

They pay off where there are many identical shells: fewer setups, less straightening of the edges and less dependence on the operator’s experience. On one-off parts of varying shape the advantage is barely felt and three-roll machines work out better value.

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